liquid damage is always a crapshoot. the good news is it doesn't look like the pee penetrated too far into the phone. the LCI (Liquid Contact Indicator) - the white oval directly above the apple logo on the battery and below the black square near the top - is still white, if liquid had reached it, it would have turned red.
for submerged phones, i usually recommend disassembling and removing the major parts (motherboard, camera, taptic, speaker, battery, etc) and treating them to a soak in 99% IPA (isopropyl alcohol) - with the exception of the rear cam and battery, those should just be wiped down with IPA. very gently use a soft bristled toothbrush to scrub away debris that may have settled on the parts. then a rinse with fresh IPA and let the parts dry in a warm environment at least overnight.
the screen is a bit trickier. you an only remove the earpiece/front-camera assembly and the back shield, the rest of the display is pretty much sealed up but if liquid got in there, it could be a problem.
to address the phone booting/non-booting issues, i recommend downloading a copy of 3utools (it's a great utility and it's free). disconnect the display from the phone, connect the base to the pc via usb and power it up. if the phone boots, 3uTools should see it and give you an summary screen, or a popup that says the phone is in recovery or DFU mode.
you'll have the option to do a flash, which installs the latest IOS, but if it's via recovery or DFU, it will probably wipe the data from the phone (hope you have a current backup).
good luck
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Can you take the screen off the phone carefully and upload a picture of the motherboard? Bilder zu einer vorhandenen Frage hinzufügen
von Andrew S
Did you download the operating system?
von Allan Barr
@barriphone It seems to have downloaded, yes.
von Calion
@andrewsawesome I opened the screen, and uploaded a picture. You can't really see the logic board, though; should I disassemble more?
von Calion
@Calion, In thinking more about this, the newer iPhones like yours are much better sealed from liquid than the older models. So in general, the only thing that's really exposed are the speakers and the lightning port. Of course, speakers won't cause the kind of problems you're seeing, so I'm leaning toward the idea that the exposure to liquid has caused damage to the port. That would explain the inability to charge, and could account for the other issues as well.
The fact that you saw the Apple logo at least once says to me that the display may well be functional and the problem is that it's not able to boot up far enough to get to the point of displaying.
You should consider replacing the Lighting port as your next step.
iPhone SE 2020 Lightning Connector Einheit tauschen
The part itself is pretty cheap; a fast search on Amazon showed a brand I've used before for only about $11 USD.
https://www.amazon.com/MMOBIEL-Connector...
von Jerry Wheeler